12. what's the simplified form of x − 1 + 4 + 7x − 3?
a. 6x
b. 8x
c. 8x + 6
d. 6x + 3
19. simplify and solve this equation: 4m + 9 + 5m – 12 = 42.
a. m = –5
b. m = -4
c. m = 4
d. m = 5
i'm really bad at simplifying

30 miles

step-by-step explanation:

we know that 60 seconds equals 1 minute and 60 minutes 1 hour

44 ft       60 sec     60 min     158400   ft

  *   *   =

1 sec       1 min       1 hour         hour

we know that there are 5280 ft per mile

158400   ft       1 mile         30 miles

  *   =

1   hour               5280 ft     1 hour

so in 1 hour   it can travel 30 miles

the answer is b: 18

step-by-step explanation:

use the pythagorean theorem to .

a^2+b^2=c^2

plug 18 for "r"

the 2 legs are 18 and 24

18^2+24^2=c^2

324+576=c^2

900=c^2

c=30

30-12=18

18 is the radius

: )

hi how are you doing today? if you ever need just tell me

step-by-step explanation: